2. Whispering Gallery: The figure below shows the specifications for an elliptical ceiling in a hall designed to be a whispering gallery. In an whispering gallery, a person standing at one focus of the ellipse can whisper and be heard by another person standing at the other focus, because all the sound waves that reach the ceiling from one focus are reflected to the other focus. If the hall below is 140 feet in length with 30 feet tall ceiling at its highest point. How far from the end walls will the foci point be?

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